build/build-clang/downgrade-mangling-error_clang_12.patch

   1 Downgrade unimplemented mangling diagnostic from error to note.
   2 This codepath is exercised by MozsearchIndexer.cpp (the searchfox
   3 indexer) when indexing on Windows. We can do without having the
   4 unimplemented bits for now as long the compiler doesn't fail the
   5 build. See also https://bugs.llvm.org/show_bug.cgi?id=39294
   6
   7 diff --git a/clang/lib/AST/ItaniumMangle.cpp b/clang/lib/AST/ItaniumMangle.cpp
   8 index 4420f6a2c1c3..4d9a6434d245 100644
   9 --- a/clang/lib/AST/ItaniumMangle.cpp
  10 +++ b/clang/lib/AST/ItaniumMangle.cpp
  11 @@ -4028,10 +4028,11 @@ recurse:
  12      if (!NullOut) {
  13        // As bad as this diagnostic is, it's better than crashing.
  14        DiagnosticsEngine &Diags = Context.getDiags();
  15 -      unsigned DiagID = Diags.getCustomDiagID(DiagnosticsEngine::Error,
  16 +      unsigned DiagID = Diags.getCustomDiagID(DiagnosticsEngine::Remark,
  17                                         "cannot yet mangle expression type %0");
  18        Diags.Report(E->getExprLoc(), DiagID)
  19          << E->getStmtClassName() << E->getSourceRange();
  20 +      Out << "MOZ_WE_HACKED_AROUND_BUG_1418415";
  21        return;
  22      }
  23      break;